Samuel Rounce srounce

There are three easy to make mistakes in go. I present them here in the way they are often found in the wild, not in the way that is easiest to understand.

All three of these mistakes have been made in Kubernetes code, getting past code review at least once each that I know of.

Loop variables are scoped outside the loop.

What do these lines do? Make predictions and then scroll down.

func print(pi *int) { fmt.Println(*pi) }

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

Populating Data in KeystoneJS

Keystone's createItems function is a simple but powerful way to populate your database with data.

It can be used to create test fixtures or initialise your database with default content / users / etc.

There's also a shorthand syntax that can be used within update files; if you are using the auto updates feature, any file that exports a create object will automatically be wrapped and the data will be created.

createItems takes two passes at the data it is passed, first creating the items and retaining references by key (if provided) that can be used to populate relationships in the second pass. This makes it easy to create related data without asynchronous nesting (which for data creation sometimes ends up in knots).

OBSOLETE

This entire guide is based on an old version of Homebrew/Node and no longer applies. It was only ever intended to fix a specific error message which has since been fixed. I've kept it here for historical purposes, but it should no longer be used. Homebrew maintainers have fixed things and the options mentioned don't exist and won't work.

I still believe it is better to manually install npm separately since having a generic package manager maintain another package manager is a bad idea, but the instructions below don't explain how to do that.

Fixing npm On Mac OS X for Homebrew Users

Installing node through Homebrew can cause problems with npm for globally installed packages. To fix it quickly, use the solution below. An explanation is also included at the end of this document.

Tutorial: Meteor in Windows using Vagrant

BEFORE YOU CONTINUE:

Now, Meteor runs in any Windows without any line of this tutorial. Just download the Meteor binary! Yay!!
mrt is no longer used with Meteor 1.0

These days some people were discussing at meteor-talk group about running Meteor at Windows and I’ve recommended them using Vagrant. It’s a very developer-friendly piece of software that creates a virtual machine (VM) which let you run any operating system wanted and connect to it without big efforts of configuration (just make the initial installation and you have it working).

Many packages (I've tested) for running Meteor+Vagrant fails because Meteor writes its mongodb file and also other files inside local build folder into a shared folder between the Windows host and the Linux guest, and it simply does not work. So I've put my brain to work and found a solution: do symlinks inside the VM (but do not use ln. Use mount so git can follow it). It’s covered on

	var d3 = require('d3');
	var jsdom = require("jsdom-little");
	var React = require('react-native');
	var { View, Text } = React;
	var Svg = require('./Svg');

	var parseDate = d3.time.format("%d-%b-%y").parse;

	var D3Chart = React.createClass({
	componentDidMount() {

	// p = require('./extract_meteor_deps');
	// Package = p.Package;
	// getPackageDeps = p.getPackageDeps; depsByPackage = p.depsByPackage;
	//
	// > getPackageDeps('spacebars')
	// ['htmljs', 'blaze', 'observe-sequence', 'templating']
	// > depsByPackage
	// {"spacebars": ['htmljs', 'blaze', 'observe-sequence', 'templating']}
	var Package, api, depsByPackage, getPackageDeps, mockApiUse, _;

	package main

	import (
	"log"
	"net/http"
	"net/http/httputil"
	)

	func main() {
	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {

	'use strict';

	var Q = require('q');

	module.exports = function (sequelize, DataTypes) {
	return sequelize.define('Snapshot', {
	time: {
	type: DataTypes.DATE
	}
	}, {

	Template.example.events({
	'change input': function(ev) {
	_.each(ev.srcElement.files, function(file) {
	Meteor.saveFile(file, file.name);
	});
	}
	});